AdvertisementCDC Recommends 3rd Vaccine Dose For Immunocompromised PeopleUpdated August 13, 2021Joe NeelfacebookEmailThe CDC recommended that people with weakened immune systems get a third shot of either the Pfizer-BioNTech or Moderna vaccine. The move follows the FDA's authorization of such use a day earlier. (AFP via Getty Images)This article was originally published on August 13, 2021.